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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf05492a03f0b00298de7506eecd64ffdd2704f2e73cacf9c50df7ee6eaa18f' 
  AND token = '7oQHf2YPhuLkF1IFeGcEM5HTGghtL1PGV6bJzmz9jIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}